Portable jig saw



Oct. 26, 1954 G. o. Hl-:ESE

PORTABLE JIG SAW Filed June l, 1955 2 Sheets-Sheet l George 0. Hees@Oct. 26, 1954 G. o. Hesse PORTABLE JIG SAW 2 Sheets-Sheet 2 Filed Junel, 1953 Fig. 6

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Patented Oct. 26, 1954 UN l T ED .S TATES PATENT F FICE PORT-ABLE JIGSAW George 0. Heese, Roswell, N. Mex.

Application June 1, 1953, S'erialN'o. 358,655

A2 Claims. l

This invention relates to new and useful improvements in jig saws andthe primary object of the present invention is to provide a jig `sawincluding a support and a blade holding inember secured at one end ofthe support by .a novel and improved spring connection whereby the bladeholding member may be oscillated in a highly satisfactory manner withthe spring means exing as the blade holding member is moved to its upperand lower limits.

Another important obj-ect `of the present invention is to provide a jigsaw including novel and improved means for imparting oscillatory motionto the blade holding member and which means is so located as to utilizethe whole benefit of the length of the blade holding member to obtain ahighly advantageous mechanical advantage.

A further object of the present invention is to provide a jig sawincluding a blade holding member having novel and. improved meanswhereby a blade may be readily'attach'ed thereto or removed therefrom ina convenient manner.

A still further aim of the present invention is to provide a jig saw ofthe aforementioned'character that is extremely simple and practical inconstruction, strong .and reliable in use, eflieient and durable inoperation, small and compact in structure, and inexpensive tomanufacture, and otherwise well adapted for the purposes for which thesame is intended.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction `andoperation as more fully hereinafter described and claimed, referencebeing had to the 'accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure l is a side elevational view 'of the present invention `and withpart of the collecting box broken away for the convenience ofexplanation;

'Figure 2 is a top plan view of Figure 1;

Figure 3 is an enlarged transverse vertical sectional view takensubstantially on the plane of section line 3-3 of Figure 1;

Figure 4 is a fragmentary perspective view of the upper leg portion ofthe blade holding member and showing a blade, in part, secured thereto;

Figure 5 is a fragmentary perspective of the lower leg portion of theyblade holding member and showing the blade, in part, secured thereto;

Figure 6 is a fragmentary perspective View of the rear end portion ofthe support and showing the spring member secured thereto; and

Figure 7 is a fragmentary view of Figure 1 and showing the manner inwhich the spring member flexes as the blade holding member is oscillatedto its upper limit.

Referring now to the drawings in detail, wherein for the purpose ofillustration, there is disclosed a preferred embodiment of thepres'entinvention, the 'numeral I0 represents an elongated flat base having anenlarged forward end portion l2. An elongated-support I4 overlies thebase and is suitably secured `thereto by fasteners or the like thatextend upwardly through the base and into the lower edge of the support.Supportlll is provided with a rear end portion I6, in the form 'of aseparate vertical strip that is secured by fasteners I8 to the bodyportion of the support.

Forward and rear spaced parallel vertical walls 2B and 22 lextendVtransversely of base I0 over end portion I2. 'These walls may besuitably secured to end 'portion I2, but the wall 22 is also secured tothe forward vertical edge of the support V4 `by 'fasteners 24 foradditional strength. The upper ends of the walls 20 and 22 `are suitablysecured to and support a horizontally disposed platform '26 having .aforward overhang portion 28 that extends forwardly of wall 20 and whichis provided with a slot 3U to accommodate a'blade B.

rEnd portion I 2 is adapted to support a removable open top, saw dustcollecting box 22 which is disposed in front of wall 20 and underoverhand ,portion 28, whereby saw dust produced while cutting work, maypass through slot 3D to be collected in box 32.

A substantially U-shaped blade holding member 34 overlies the support I4and includes an upper leg portion 36, the lower leg portion 38 and aconnecting portion 4U. The connecting portion 40 vis preferablyintegrally formed with the rear end of leg portion .S8 `and engages therear end of leg portion 36. A bolt 42 extends through registering boresin the leg portion 36 and connecting portion 40 and has a complementalnut whereby leg portion 36 may be separated from or secured to portion4I).

Means is provided for connecting the blade holding member v'3ft to thesupport M forl vertical swinging or oscillatory motion. This meanscomprises an L-shaped leaf spring or resilient member 44, having avertical portion 4-'6 which is secured against the lrear `'face of stripI6 by fastening .means 48. The horizontal 'portion 50 of spring Mextends forwardly over strip I6 and into a horizontal slot 5I in portion40 and is held therein by bolt 42 which extends through an'accommodating aperture in portion 50.

Means is provided for imparting `oscillatory motion to the blade holdingmember 34. This means includes forward 'and rear bolts 52 and 513 thatextend ydoiivnw'ardly through apertures in the forward part oflegportion38. A lower strip 56 extends between the bolts and under the leg portionSIland the 'ends of s'trip'56 are apertured to slid'ably engage thebolts L52 and 54. 'Nuts or abutments 56 and 66 yare threaded on thelower end of bolts 52 and thunder vthe strip 56, and form restsfor'strip56. A second strip 62 extends between the bolts 52 Aand 54,under leg portion 38, and over stripr. The ends of strip 62 are alsoyprovided with apertures that receive the bolts 52 .and 54. Coil springs84 and 68 are engaged on bolts 52 and 54 and are biased between strips58 and 82 to yieldingly urge the strip 82 against the under surface ofleg portion 38 and strip 5t against abutments 58 and B8.

An electric motor 68 is secured to the end portion I2 of base I0 and thearmature shaft 'l0 extends transversely of the base and under legportion 38 between and spaced from the bolts 52 and 54. An eccentric orcam 12 is secured to the armature shaft 'l0 and is disposed between thestrips 56 and G2 to oscillate member 34 as the shaft 'I8 rotates.

The walls 28 and 22 are provided with registering vertical guide slots74 and 18 that slidably receive the lower leg portion 38 to restricthorizontal movement of blade holding member 34 as the same is oscillatedby powered eccentric '12.

Means is provided for removably holding the blade B extended between theforward ends of leg portion 8S and 38. This means comprises a lowerholding strip 78 secured to the upper edge of leg portion 88 and havinga forward bifurcated downwardly concaved end portion 80 that extendsforwardly from leg portion 38 to engage the lower end and holding pin Pof blade B.

Channel bracket 82 is secured to the forward end of leg portion 38 andthe ends of the bracket extend upwardly from leg portion 33 and supporta pin Elfi that is spaced above and which eX- tends transversely of legportion 36. An arm 88 overlies leg portion 38 and rests upon pin 84between the upstanding ends of bracket 82 for rocking movement. Thefoward bifurcated upwardly concaved end 68 of arm 86 engages the upperend of holding lug or pin P of blade B.

A boit 95 extends upwardly through an aperture in leg portion 35 behindbracket 82 and also extends upwardly through an aperture in the rear endof arm 8B. A wing nut 92 is threaded on the upper end of bolt Q0 andengages upon the rear end of arm 88 to adjust the arm 86 about pin 84for tightening blade B.

A lower guide strip 94 is secured over strip 'i8 and includes anupwardly and forwardly curved bifurcated end portion 96 that receivesblade B. An upper guide strip 98 is secured to the forward end of legportion 35 and includes a downwardly forwardly curved bifurcated |00that engages the upper part of blade B.

In practical use of the present invention, a blade such as blade B maybe readily attached to the blade holding member 34 by loosening nut 52and engaging pin P over end 88 after pin P has been gaged under thebifurcated end portion 80 of strip 58. Then nut 92 is tightened to pullthe blade B upwardly and retain the blade straight and tensioned.

As the eccentric l2 is driven, the same will ride against the strips 56and G2 to impart oscillatory motion to member 34. As member 34 is swungupwardly, portion 46 will be spaced from the rear face of strip i6 tourge the member 34 to its normal horizontal position in response torotation of the eccentric 'I2 in order to obtain a true up and downstroke for the member 34.

From the foregoing, the construction and operation of the device will bereadily understood and further explanation is believed to beunnecessary. However, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction shown and described, andaccordingly all suitable modifications and equivalents may be resortedto, falling within the scope of the appended claims. What is claimed asnew is as follows: 1. A jig saw comprising a base, an elongated supportsecured to the base and having forward and rear end portions, asubstantially U-shaped blade holding member including upper and lowerlegs and a connecting portion joining said leg portions at their rearends and disposed at the rear end of said support, a spring membercarried by the rear end portion of said support and engaging saidconnecting portion to support said blade holding member for verticalswinging movement, means on the base engaging the lower leg portion toimpart oscillatory motion to said blade holding member, a platformsupported on the base over said lower leg portion and under said upperleg portion and having an opening to accommodate a saw blade carried bythe forward ends of said leg portions, and means carried by the forwardends of said leg portion for holding a blade, said spring membercomprising an L- shaped leaf spring having a vertical portion and ahorizontal portion, said vertical portion being secured to the rear endportion of said support and said connecting portion having a horizontalsot in which the horizontal portion of said spring is secured.

2. A jig saw comprising a base, an elongated support secured to the baseand having forward and rear end portions, a substantially U-shaped bladeholding member including upper and lower legs and a connecting portionjoining said leg portions .at their rear ends and disposed at the rearend of said support, a spring member carried by the rear end portion ofsaid support and engaging said connecting portion to support said bladeholding member for vertical swinging movement, means on the baseengaging the lower leg portion to impart oscillatory motion to saidblade holding member, a platform supported on the base over said lowerleg portion and under said upper leg portion and having an opening toaccommodate a saw blade carried by the forward ends of said legportions, and means carried by the forward ends of said leg portion forholding a blade, said spring member comprising an L-shaped leaf springhaving a vertical portion and a horizontal portion, said verticalportion being secured to the rear end portion of said support and saidconnecting portion having a horizontal slot in which the horizontalportion of said spring is secured, said connecting portion beingintegrally formed with the rear end of said lower leg portion and afastener extending through said connecting portion, said horizontalportion of said spring and the rear end of said upper leg portion toremovably secure the connecting portion to the upper leg portion and thehorizontal portion of the spring in the slot.

References Cited in the file of this patent UNITED STATES PATENTSNumbei- Name Date Re. 7,725 Plummer June 5, 1877 116,208 Mitchell June20, 1871 118,498 Wallace Aug. 29, 1871 181,762 Anderson Sept. 5, 1876188,225 Arthur Mar. 13, 1877 2,111,036 Wippel Mar. 15, 1938 FOREIGNPATENTS Number Country Date 819,000 Germany Oct. 29, 1951

